Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02328361 2000-12-14
ESCALATOR STEP WTTH REMOVABLE DEMARCATION INSERTS
Background of the Invention
Escalator steps are usually formed by a casting or extrusion manufacturing
process.
The step plates are pre-formed with a tread pattern on the step pallet top and
riser.
Typically, the treads are in the form of a series of parallel grooves
extending from the front
to the back of the plate. The grooves are further dimensioned to engage with
comb
structures at the floor landing portions of the escalator.
As the escalator steps are in constant motion with respect to the escalator
sides or
balustrades, demarcation means are typically applied to the steps to
facilitate safe use of
0 the escalators. The demarcation means provide a visual aid which helps the
rider locate
and thus avoid the sides and forward riser edges of the step. Typically, the
demarcation
means comprise a colored marking which is in contrast to the other portions of
the step.
The demarcation means may also provide a physical barrier to the side edges of
the step
by being slightly raised above the tread level of the step surface.
Current methodologies for applying demarcation means to an escalator step edge
include the painting of an appropriate strip onto the step surface, mounting a
demarcation
strip upon the surface of a step edge by the use of screws, nuts or bolts or
rivets, or
preforming a demarcation riser as part of the casting or extrusion step in the
manufacture
of the step.
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The use of painted strips requires constant maintenance, as the markings wear
away
upon use. The fastening of a demarcation strip with screws, rivets and the
like, upon the
step surface provide concentrated mechanical stresses about the fastening
points and often
lead to premature failure. The incorporation of demarcation strips as part of
the step
proper prevents replacement and substantially increases the costs of
manufacture.
It is accordingly a purpose of the present invention to provide a new and
improved
demarcation strip for use on escalator steps which may be easily replaced as
required.
A further purpose of the present invention is to provide a demarcation strip
which
is easily mountable and replaceable on the step, and which does not generate
localized
0 forces which may lead to premature failure.
A still further purpose of the present invention is to provide an escalator
step formed
to accept replaceable demarcation strips having the aforementioned
characteristics.
Brief Description of the Invention
In accordance with the foregoing and other purposes and objects, the
demarcation
5 strip of the present invention comprises an insert which is mountable to an
escalator step
through the mating of corresponding portions of the step and insert forming a
friction
and/or interference lock arrangement. The escalator step is formed with
recessed edge
portions adapted to accept the insert whereby the insert serves as the
respective edge of the
step. The demarcation strip can be formed in separate riser and tread portions
which
) interconnect upon mounting to the step to provide increased rigidity and
stability.
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Brief Description of the Drawin~.s
A fullez understanding of the present invention will be obtained upon
consideration
of the foIlowing description of preferred, but nonetheless illustrative
embodiments of the
invention when reviewed in association with the annexed drawings, wherein:
Fig. 1 is an illustration of a conventional escalator construction with which
the
present invention is employed;
Fig. 2a is a side elevation view of an escalator step pallet in accordance
with the
invention, adapted to accept a demarcation insert thereof;
Fig. 2b is a front elevation view, partially broken away, of the escalator
step pallet
0 of Fig. 2a;
Fig. 3a is a side elevation view of step tread and riser demarcation inserts
in
accordance with the invention shown joined together;
Fig. 3b is a front elevation view of the step tread demarcation insert in
section taken
along line 3' -3' of Fig. 3.
5 Fig. 4a is a side elevation view of an escalator step showing both step
tread and
riser demarcation inserts in place;
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Fig 4b is front elevation view, partially broken away, of the escalator step
and inserts
of Fig. 4a;
Fig. 5 is a side elevation view, in section, of an escalator step having step
tread and
riser inserts mounted thereon by an alternative locking means;
Fig. 6 is a detail view of the locking means of Fig. 5 in section taken along
line 6-
6 of Fig. 5;
Fig. 7 is a front elevation view, partially broken away, of a portion of an
escalator
step pallet incorporating cast-in retaining channels to hold demarcation
inserts of the
present invention in place;
0 Fig. 8 is section view of a demarcation insert formed to mount on the step
pallet
depicted in Fig. 7;
Fig 9 is a front elevation view, partially broken away, depicting the
demarcation
inserts of Fig. 8 mounted on the step pallet of Fig. 8; and
Fig. 10 is a side elevation view of a pair of interconnected demarcation
inserts of Fig.
5 8 showing the interconnection therebetween.
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Detailed Descrivtion of the Invention
With initial reference to Figure 1, escalator 1 includes a plurality of step
pallets 2
which are interconnected and circulate between upper and lower floors or
levels. The step
pallets are located between a pair of balustrades 3, only one of which is
shown, which are
typically provided with an endless handrail 4 which moves in synchronism with
the steps.
Each of the step pallets 2 includes a generally horizontally-extending step
tread 5 portion
and a vertical front riser portion 6. The lateral sides of both the step tread
portion 5 and
the riser portion 6 bear demarcation means to signify and identify their
location and direct
the riders away therefrom. The step pallets 2 may be of a cast construction,
in which the
step plate 5 and front riser 6 are integrally formed.
Figures 2a and 2b depict an escalator step pallet 2 configured for acceptance
of
demarcation inserts in accordance with the present invention. As depicted
therein, each
lateral edge of the step is formed with an exposed notch or slot 7 extending
along the side
of both the step tread portion 5 and the riser portion 6. Each notch is
dimensioned to
accept a pair of demarcation inserts, such as illustrated in Figures 3a and
3b. The notched
portion of the step may be formed with a pair of parallel projections or
guides 8 to allow
positioning of the demarcation inserts thereon and assist in loclcing them in
place.
Advantageously, the step 2 may be cast with both an integral tread groove
pattern 10 on
both the step tread and riser portions with the slot or notch 7 and guides 8
integrally
formed therein.
Both the step tread and riser portions are provided with one or more pairs of
small
projections 9 located 'on their interior surfaces, and pairs of angled access
slots 11 and 12
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through the step pallet forwardly and rearwardly of the projections. The
projections 9
comprise a portion of mating locking means for the demarcation inserts while
the slots 11
allow the corresponding locking means on the demarcation inserts to pass
through the step
pallet to engage the projections 9. The access slots 12 allow insertion of a
tool to disengage
the locking means to allow release of the instaIled demarcation inserts.
Figures 3a and 3b depict portions of step plate and riser demarcation inserts
13 and
14, respectively, in accordance with the invention for mounting on the
escalator step of
Figures 2a and 2b. Both demarcation inserts are formed with the tread or
groove pattern
to align with the pattern on the step tread portion 5 and riser portion 6. The
.0 demarcations insert may be formed with an integral raised edge 18 which is
positioned to
ride flush against the inner face of the escalator balustrade skirt to further
direct the user
away from the step edge. A pair of spaced parallel grooves 15 are located on
the lower
face of each insert to mate with the corresponding guides 8 on the step. Pairs
of locking
members 16 are provided on the lower surface of each of the demarcation
inserts to assist
5 in retaining the inserts on the step. Each locking member is in the form of
a flexible arm
having a generally perpendicular locldng tab 21 at its end. An angled access
slot 17
extends through the demarcation insert adjacent the locldng means and is
positioned to
align with the corresponding access slot 12 on the step. The demarcation
inserts may be
cast of a similar or complementary material to that of the step pallet ,
including metal and
J plastic compositions.
Figures 4a and 4b show the demarcation inserts of Figures 3a and 3b mounted
upon
the step 2 of Figures 2a and 2b. The tread pattern 10 on the surfaces of the
inserts align
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with and continues the tread pattern appearing on the step tread and riser
portions, while
the raised edge 18 on the step tread demarcation insert serves as a flush
continuation of
the side edge 19 of the step. The inserts are aligned and held in place upon
the step by
the combination of the guides 8 and the loclcing members 16. The step tread
demarcation
insert 13 is mounted to the step tread portion 5, while the riser demarcation
insert 14
mounts to and protects the edge of the riser portion 6. The inserts 13 and 14
may have an
interloclcing construction to removably fasten them together upon installation
upon the step.
As may be seen, the forward edge 22 of the step tread insert 13 is formed with
a semi-
dovetail flange 23. The step tread insert is preferably constructed and sized
to ternzinate
rearwardly of the step's front edge. The riser demarcation insert 14 is
preferably formed
in the general shape of an inverted L, the horizontal leg portion 24 thereof
being sized to
abut against the forward edge of the step tread demarcation insert 13. The
leading edge
of the leg portion 24 is formed with a semi-dovetail longitudinal recess which
mates with
the corresponding flange 23 on the step tread insert 9, the interlocking
nature of the joint
5 preventing the riser demarcation insert from separating from the step pallet
while retaining
the step tread insert on the step.
The step tread insert 13 may be mounted to the step tread portion through a
generally downward and rearwardly sliding positioning action, whereby the
locking means
16 pass through the access slots 11 in the step tread portion of the step into
a locking
) engagement with the projections 9. The riser demarcation insert is then slid
in a similar
manner downwardly and inwardly towards the riser portion of the step, its
locking means
16 engaging the corresponding projections 9 of the riser portion through the
associated
access slots 11 in the riser portion of the step. While the combination of the
interengaged
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dovetail portions and the locking means and projections maintain the
demarcation inserts
in place upon the step pallet, the insertion of a rod-like tool from the step
surface through
an access slot 12/17 allows the head of the locking means 16 to be released
and disengaged
from the corresponding projection 9, thus freeing the demarcation insert for
removal and
replacement when service is required.
Figures 5 and 6 depict an alternative means for mounting the demarcation
inserts
to the step pallet. As shown therein, pairs of locking elements 25 may be
located along the
bottom edge of the inserts for retention purposes. As further depicted in
Figure 6, the
bottom edge of the demarcation insert 32 may be formed with a pair of opposed
lock arms
0 26 having enlarged head portions 27. The corresponding guides 8 in the step
are formed
with slots or detents 28 to receive the heads, the flexibility of the arms
allowing the lock
arms to flex inwardly to allow the heads to pass into the retention slots.
Alternatively, a
keyway may be formed into the guides to allow the heads to slide into
engagement with the
retaining grooves. An angled access slot (not seen) may be provided to allow a
tool to be
5 inserted to release the heads 27 when removal of the demarcation insert is
required.
Figure 7 depicts a step pallet 2 in which both the step tread and riser
portions
include a laterally-extending channel 29 formed into the side edges thereof,
in addition to
the guides 8. Figure 8 depicts an associated step tread demarcation insert 13
in section, in
which a corresponding lateral flange 30 is provided. Figure 9 presents the
demarcation
) insert mated to the tread plate portion. Once again, the step plate
demaication insert is
mounted on the step, with a sliding fit rearwardly from the front of the step.
The riser
demarcation insert is then mounted to the riser portion of the step with a
similar sliding fit
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downwardly onto the front of the step, the dovetail elements on the two
inserts joining the
elements together and retaining the tread plate insert in proper front-to-back
orientation.
In this construction, the riser demarcation insert can have a relatively small
horizontally-
extending portion, without a lateral flange. The channel 29 for the step tread
portion can
start behind the location of the horizontal portion of the riser insert to
avoid interference
when the riser insert is installed.
As seen in Figure 10, the rearward edge of the riser demarcation insert can be
provided with a cut-away or recessed portion 33 on one the side rail portion.
The side rail
portion of the step tread insert is formed with a corresponding small flap or
tab portion 31.
0 Additionally or alternatively the recessed and flap portions may be located
at different
locations, such as on the tread-forming areas of the inserts. The flap is
dimensioned to be
resilient, allowing it to be slightly disposed upwardly by use of a suitable
tool when the riser
insert is installed to allow passage of the riser insert into engagement with
the dovetail
portion of the step tread insert. With the riser insert in place the flap
mates with the
recessed portion 33, retaining the riser insert in place. For insert removal a
tool can again
be used to slightly displace the flap to allow the riser insert to be raised
and removed,
followed by removal of the step tread insert. Advantageously, this
construction eliminates
the need for hooked arms as previously described.
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